Cassis, France offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Cassis is known for the Calanques National Park and the Cap Canaille cliffs. The best time to travel to Cassis, France, is from May to September, when the average air temperature is around 70-80°F (21-27°C) and the water temperature is approximately 68-75°F (20-24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!